Operation

SIRQ

ABRKI

WAS

IRQ CAUSED N BY BEGINNING

OF A BREAK

?

Y

CLEAR CHANGE-IN-

BREAK STATUS BIT

ABRKI1

HASN END-OF-BREAK

IRQ ARRIVED

YET

?

Y

CLEAR CHANGE-IN-

BREAK STATUS BIT

REMOVE BREAK

CHARACTER FROM

RECEIVER FIFO

REPLACE RETURN

ADDRESS ON SYSTEM

STACK AND MONITOR

WARM START ADDRESS

SIRQR

RTE

INCH

DOES

CHANNEL A N RECEIVER HAVE A

CHARACTER

?

Y

PLACE CHARACTER

IN D0

RETURN

Figure 23-26. UART Mode Programming Flowchart (Sheet 4 of 5)

23-34

MCF5282 User’s Manual

MOTOROLA

Page 508
Image 508
Motorola MCF5282, MCF5281 user manual Uart Mode Programming Flowchart Sheet 4